the "overheard" bit in the guardian tv guide can be funny sometimes. i think it would be harder to make stuff like that up, real conversations can be extremely funny, even to the point where i've laughed in people's faces.

if you like that, check out the regularly utterly fucking BRILLIANT www.themanwhofellasleep.com.
he has a weekly update of things he overhears people saying on the tube.
and just pages and pages of really random, but really excellent content.